[MacPorts] #54175: vtk: Add python36 variant

[MacPorts]

#54175: vtk: Add python36 variant
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 Reporter:  mf2k         |      Owner:  stromnov
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  vtk
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 Please add a python36 variant to vtk.

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Ticket URL: <https://trac.macports.org/ticket/54175>
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